摘要
在上等田和中上等田及中迟熟高产良种条件下,通过水稻生长前、中、后期氮素不同施用量和施用方法比较试验,改进水稻施氮技术。结果表明,一季总氮量172.5kg/hm2,可满足目标产量要求;水稻生长的前、中、后期施氮比例以6∶3∶1产量较高,并能达目标产量;前期分蘖肥以插秧后5~6d适当重施氮肥,插秧后10~12d轻施氮肥有利于控制无效分蘖和创造条件施穗肥;中期穗肥分2次施比1次施更有利于培育高产群体和提高穗粒数;后期适当施氮有显著增产效果。
The nitrogen fertilizer practice in double crop rice has been improved by our experiments including different quantities and different methods at the earlier, middle and later stages of the growth of rice. The result shows that the total nitrogen amount of 172.5kg/hm 2 can meet the requirement of the target yield of single-crop rice, and that higher output can be achieved with nitrogen applied at the earlier, middle and later stages respectively in a ratio of 6∶3∶1. It is also shown that the more nitrogen fertilizer practice for tillering at 5~6 days and less at 10~12 days after transplanting would advantageously control invalid tillers and could improve condition for fertilizer at spike stage. Dressing for earing, twice instead of once at the middle stage, much more advantage high-yield population and improve the grains/ear. Then, at the later stge, a higher production can be obtained significantly by the practice of approriate amount of nitrogen.
出处
《中国农学通报》
CSCD
1997年第4期21-23,共3页
Chinese Agricultural Science Bulletin
基金
广东省"八五"农业科技攻关项目
关键词
水稻
氮肥
施肥
增产效果
双季稻
Rice Nitrogen fertilizer Fertilizer practice Effect of increasing yield